Another short one that gets a huge point across. I like how you can get so many different stories out of this one line (I suppose that may not be the intent of a contest idea like this if they want you to create a concrete, specific tale in six words, but I personally think it's a good thing). Start thinking about situations and mistakes you can make in life where you start to think of yourself as not a good person, and there's virtually an infinite number of possibilities. I think this (and other extremely short 'stories' like it) would make good writing prompts. Show it to someone and then have them write the expanded scene/story that fits it. It would be an interesting challenge.
As far as the challenge of writing something compelling in such a short range, you hit the bullseye.
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Update--it's such a good feel.. more..